Convection induced by composition gradients in miscible systemsConvection induite par des gradients de composition dans les systèmes miscibles |
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Authors: | Vitaly A. Volpert John A. Pojman Rozenn Texier-Picard |
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Affiliation: | 1. MAPLY UMR 5585, Université Lyon 1, 69022 Villeurbanne cedex, France;2. University of Southern Mississipi, 2609 West Fourth Street, M''Cleskey Hall, Roam H, Hathesbrug, MS 39406, USA |
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Abstract: | When two miscible fluids, such as glycerol (glycerin) and water, are brought in contact, a large concentration (and density) gradient exists, which relaxes through diffusion. With a mathematical model based on the Korteweg stress, we show that convection can occur which is analogous to surface-tension induced convection (STIC) or Marangoni convection. Specifically, we show that with realistic parameters significant flows can occur with plane interfaces and that drops of miscible fluids can act like their immiscible counterparts. Regarding plane interfaces, an experimental confirmation of this phenomenon is planned for the International Space Station. To cite this article: V.A. Volpert et al., C. R. Mecanique 330 (2002) 353–358. |
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Keywords: | fluid mechanics computational fluid dynamics convection miscible fluid diffuse interface microgravity interfacial tension mécanique des fluides mécanique des fluides numérique convection fluides msicibles intreface diffuse microgravité tension superficielle |
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